Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 20
Sanskrit:
चक्षुस्त्वष्टरि संयोज्य त्वष्टारमपि चक्षुषि ।मां तत्र मनसा ध्यायन् विश्वं पश्यति दूरत: ॥ २० ॥
ITRANS:
cakṣus tvaṣṭari saṁyojyatvaṣṭāram api cakṣuṣimāṁ tatra manasā dhyāyanviśvaṁ paśyati dūrataḥ
Translation:
Merging one’s sight into the sun planet and then the sun planet into one’s eyes, one should meditate on Me as existing within the combination of sun and vision; thus one acquires the power to see any distant thing.